What are the changes in 5th Edition of FMEA manual?

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Jimmy123

Involved In Discussions
#3
The 5th edition, is the 1st edition. The core method is still the same. Same questions has to be answered. Instead of 120 possible RPN’s you have now 3 classes of action priorities. High, Medium and Low. In my opinion the description of the tables are unclear. You can find some ratings with L and anyway high risks for a customer complain. S= 10 is for safety, and S=9 for governance effects. Indicator doesn’t work is it 9 or 10? You can get a ticket or you can get an accident, if the indicator doesn’t work. If you cut the skin, if you loss the finger or if you loss the arm or your life all is S=10.
 

Bill Levinson

Industrial Statistician and Trainer
#5
The 5th edition, is the 1st edition. The core method is still the same. Same questions has to be answered. Instead of 120 possible RPN’s you have now 3 classes of action priorities. High, Medium and Low. In my opinion the description of the tables are unclear. You can find some ratings with L and anyway high risks for a customer complain. S= 10 is for safety, and S=9 for governance effects. Indicator doesn’t work is it 9 or 10? You can get a ticket or you can get an accident, if the indicator doesn’t work. If you cut the skin, if you loss the finger or if you loss the arm or your life all is S=10.
I remember expressing a concern when it was being developed that you can get a Low rating for a failure mode that involves a 9 or 10 severity rating, which was not previously possible. Even if you got a RPN of 9 or 10, it required attention. If I look at page 208, it looks like you can in fact get a Low action priority as long as the Frequency and Monitoring ratings are low (good) enough.

The Army's Risk Management process has four risk levels, and it is impossible to get a Low rating for the highest severity category.
 

Bill Levinson

Industrial Statistician and Trainer
#7
Where to get a copy?
It's public domain as a publication of the U.S. Government. I'll add it as a free resource too.

It brings up a point not raised in FMEA; that the risk of occurrence (ATP 5-19 calls it frequency) isn't just the individual chance of occurrence, it also reflects the frequency with which we are exposed to the risk, e.g. how many times we do the job, or how many parts we make.
 

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